Alkenes

Give two reasons why compounds A and B exist as geometric isomers. (2)

restricted/ no rotation about the double bond/C=C (1) • (two) different groups on each carbon (of the double bond)/the carbons (of the double bond) (1)

Interpret the ratio: One mole of alpha-ocimene reacts with 3 moles of \(\text{H}_{2}\). Because each \(\text{C=C}\) double bond requires 1 mole of \(\text{H}_{2}\) to become a single bond, all three \(\text{C=C}\) double bonds in the molecule are completely hydrogenated.

when classifying a carbocation as primary, secondary, or tertiary.

What matters is how many carbon atoms are directly bonded to the positively charged carbon (\(\text{C}^{+}\)), regardless of what else (like an iodine atom) is attached to those carbons.